Improvement in drivers for boot and shoe nailing machines



A. lS. LIBBY. Drivers for Boot and Shoe: Mailing-Machines. N0. 143,699. Patented0ct.14,u187 3.

UNITED STATES.

PATENT OFFICE.

ASA S. LIBBY, OF LAWRENCE, MASSACHUSETTS.

IMPROVEMENT IN DRIVERS FOR BOOT AND SHOE NAILING MACHINES.

Specification forming part of Letters Patent No. 143,699, dated October 14, 1873 appli( ation filed August 14,1s72.

Patent N os. 76,150 and 122,985, great difficulty is experienced in getting driverswhieh, having the requisite form, also possess' strength, rigidity, and toughness sufficient for their work.

In my invention I take a piece of round steel Wire and draw its driving end in a pair of rolls having V-shaped peripheral grooves, the two rolls meeting at the plain surfaces, and their action upon the Wire induratin g and imparting to it the cross-sectional lozengel shape to fit the nail-tube, and the nails driven by it through such tube. My invention consists in such a driver.

The drawing represents side views of it at A and B, an end view of its driving end at C, and an oppositeend view at D.

a denotes :the round steel wire; b, the lozenge-shaped shank, which is formed from the round Wire by cold-drawing the round Wire into the quadrangular shape inthe two V shaped grooves of the pair of rolls.

I claim- The naildriver made from round wire, having its driving end drawn into prisniatic shape and hardened, substantially as described.

A. S. LIBBY.

Witnesses FRANCIS GOULD, M. W. FROTHINGHAM. 

